Elevator-door-operating mechanism.



No. 735,056. PATENTED, AUG. 4, 1903.

H. EITHER.

ELEVATOR DOOR OPERATING MECHANISM.

APPLICATION TILED MAB. 5, 1903.

NO MODEL.

.lflmllllllllllllllllllllllllllllllmllf THE NORRIS PETERS co wow-urnswuumcn'm, nv cv Iatented August 4, 1961 PATENT OFFICE.

HARRY BITNER, OF BERWYN, ILLINOIS.

ELEVATOR-DOOR-OPERATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 73 5,056, dated August4, 1963.

Application filed March 5,1903- Serial No. 146,296. (No model.) I

To all whom, it may concern.-

Be it known that I, HARRY BITNER, a citizen of the United States ofAmerica, residing at Berwyn, in the county of Cook and State ofIllinois, haveinvented certain new and usefnl Improvements inElevator-Door-Operating Mechanisms, of which the following is aspecification.

My invention relates to certain new and useful improvements inelevator-door-operating mechanisms; and its object is to produce adevice of this class for use in connection with doors of the typewherein two doors are slid at different speeds and in the same directionaway from the door-opening, one of the doors moving behind the other.

The particular object of the mechanism is to cause the two doors thus tomove together, but at different speeds.

To this end my invention consists in certain novel features ofconstruction, which are clearly illustrated in the accompanying drawingsand set forth in this specification.

In the aforesaid drawings, Figure 1 is an elevation of the main frame ofan inclosure the opening of which is provided with doors having myimproved operating mechanism, the doors being shown in three dilferentpositions, two of which are shown by dotted lines; and Fig. 2 is an endview of the doors with the wall of the inolosure, showing the operatingmechanism, the view being in the direction indicated by the arrow inFig. 1.

Referring to the drawings, A and B are suitable tracks of the ordinarytype supported on the wall of the inclosure, which is indicatedby O.

D is the fast door, and it is supported upon the track A by brackets dand rollers d. E is the slow door, which is similarly supported upon thetrack B by brackets e and rollers c. To the top corner of the fast dooris pivoted a link F by a bracketf. To the wall of the inclosure,adjacent to the opening provided for the doors, is pivoted a link G by apin g, said link being pivotally connected at its other end to the linkF. These two links, as here shown, are of the same length, their lengthbeing equal to the width of one of the doors and their brackets being sopositioned that when the doors are closed the link F is horizontal andthe link G is vertical. A link H connects the pivot be tween the twolinks F and G with a bracket h on the slow door E, the link H, as shown,being half the length of the links F and G and lying in line with thelink G when the doors are closed.

The operation of this device will be readily apparent from the drawings,the parts being indicated by dotted lines in two other and difierentpositions from that shown in full lines. In the first of these positionsthe reference-letters are similar, but are distinguished therefrom byprimes, and in the second position, wherein the doors are fully 0pen,theletters are similar,but distinguished by seconds. It will be noted thatas the doors move from the position indicated by D E, throughthatindicated by D E to that shown by D E the link F swings from theposition indicated in full lines downward from the horizontal throughthe position indicated by F and eventually into the vertical positionindicated at W. Simultaneously the link G swings from the verticaldownward th ough the position G to the horizontal position in dicated byG The junction between the two links F and G swings in an arc of acircle from its original position about the bracket 9 as a center, andas it moves it pulls upon the link H, drawing it through the positionindicated by H to the vertical position indicated by H This, it will benoted, draws the slow door open and causes it to come to rest in itsopen position at exactly the same time that the fast door reaches itsopen position. The result of this connection is that the two doorsrareso synchronized that both reach their full-open and their full-closedpositions at the same time. A lug I is provided at the margin of theslow door to engage with the fast door and prevent any undue length ofslide on the part of the doors. It has a further object in that itpermits the fast door to strike the slow door at the time when said slowdoor is moving very slowly and when little force is being exerted uponit, thereby pushing the door positively into the desired position. Alsoin starting from the open position the link F engages the lug I andcarries the slow door along until the parts swing past the dead-center.

I realize that considerable variation can be made in the details of thisconstruction, and I do not, therefore, desire to limit myself to theparticular form herein described. I claim as new and desire to secure byLetters Patent 1. The combination with the framework of aninclosurehaving a doorway therein, of two parallel doors adapted, when extended,to.

close the opening, and when opened, to slide one alongside of the other,and a connection between the two doors and the inclosure comprising asubstantially horizontal rod pivoted at one end to one of the doors, asecond rod substantially vertical, pivoted at one end to the oppositeend of the horizontal rod, said second rod being pivoted at its oppositeend to the inclosure, and means of connection between said rods and theother door.

2. The combination with the framework of an inclosure having a doorwaytherein, of two parallel doors adapted, when extended, to close theopening, and when opened to slide one alongside of the other andaconnection between the two doors and the inclosure comprising asubstantially horizontal rod pivoted at one end to one door, a secondrod substantially vertical, pivoted at one end to the other end of thefirst rod and at the other end to the inclosure, and means of connectionbetween the mutual pivot of the rods and the other door.

3. The combination with the framework of an inclosure having a doorwaytherein, of two parallel doors adapted, when extended, to close theopening, and when opened to slide one alongside of the other and aconnection between the two doors and the inclosure comprising asubstantially horizontal rod pivoted at one end to one door, a secondrod substantially vertical, pivoted at one end to the other end of thefirst rod and at the other end to the inclosure, and a link connectingsaid rods to the other door.

In witness whereof I have signed the above application for LettersPatent, at Chicago, in the county of Cook and State of Illinois, this14th day of February, A. D. 1903.

HARRY BITNER.

Witnesses:

RUSSELL WILES, CHAS. O. SHERVEY.

